[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fJf3pF8ytEI3Rr_n5j9PT8WkfRzVanlzY3l_0nwQRnHk":3},{"lesson":4},{"id":5,"slug":6,"article_id":7,"title":8,"body":9,"prevention":10,"framework_refs":11,"status":23,"created_at":24,"published_at":25,"article":26,"tags":30,"podcasts":49},"87465b47-f7f3-4d5e-ac49-b3dde544379f","cisco-ise-zero-day-cvss-100-allows-full-auth-bypass-patch-immediately","826b1083-3c61-4ebc-ad43-be1cc37eb0b5","Cisco ISE Zero-Day (CVSS 10.0) Allows Full Auth Bypass — Patch Immediately","A critical zero-day vulnerability in Cisco's Identity Services Engine (ISE) — a cornerstone of network access control — allows unauthenticated remote attackers to completely bypass authentication and achieve root-level command execution, earning a perfect CVSS score of 10.0. Because ISE acts as a gatekeeper for network access policies, its compromise can cascade into full network takeover, credential theft, and lateral movement across enterprise environments. Active exploitation in the wild means organizations running unpatched versions face immediate, real-world risk with no available workaround. This incident underscores the danger of delaying patches on perimeter-facing identity infrastructure, where a single flaw can nullify an entire security architecture. The absence of compensating controls makes rapid patching the only viable defensive action.","**Immediate actions:**\n- Upgrade all affected Cisco ISE and ISE Passive Identity Connector instances to the vendor-patched versions without delay.\n- Restrict network access to ISE management interfaces using firewall rules or ACLs to limit exposure to trusted IP ranges only.\n- Activate threat detection monitoring for anomalous authentication events or unexpected privileged command execution on ISE nodes.\n\n**Long-term improvements:**\n- Establish an emergency patching SLA (e.g., ≤24 hours) specifically for CVSS 9.0+ vulnerabilities affecting identity and access management systems.\n- Maintain a continuously updated, authoritative inventory of all network appliances and their software versions to enable rapid impact assessment during zero-day disclosures.\n- Apply strict network segmentation to isolate identity infrastructure (ISE, LDAP, AD) from general corporate and production networks.\n\n**Detection measures:**\n- Deploy SIEM rules to alert on unauthenticated access attempts or privilege escalation events originating from ISE nodes.\n- Integrate Cisco PSIRT advisories and threat intelligence feeds into your vulnerability management platform for real-time zero-day awareness.\n- Conduct regular authenticated vulnerability scans against network access control systems to detect unpatched or misconfigured components.",[12,13,14,15,16,17,18,19,20,21,22],"CIS Control 7: Continuous Vulnerability Management","CIS Control 12: Network Infrastructure Management","CIS Control 6: Access Control Management","NIST SP 800-53 SI-2: Flaw Remediation","NIST SP 800-53 AC-3: Access Enforcement","NIST SP 800-53 SC-7: Boundary Protection","NIST CSF ID.RA-1: Asset Vulnerabilities Identified","NIST CSF RS.RP-1: Response Plan Executed","ISO\u002FIEC 27001:2022 A.8.8: Management of Technical Vulnerabilities","ITIL 4: Change Enablement — Emergency Change Process","PTES: Vulnerability Assessment and Patch Verification","published","2026-09-17T17:21:40.727834+00:00","2026-09-17T17:21:40.566+00:00",{"id":7,"url":27,"slug":28,"title":29},"https:\u002F\u002Fthehackernews.com\u002F2026\u002F09\u002Fcisco-warns-of-new-zero-day-ise-auth.html","cisco-warns-of-new-zero-day-ise-auth-bypass-cvss-10-0-exploited-in-active-attack-fefb67","Cisco Warns of New Zero-Day ISE Auth Bypass (CVSS 10.0) Exploited in Active Attacks",[31,37,43],{"id":32,"name":33,"slug":34,"description":35,"color":36},"05757c8d-6b93-4194-b35d-7359e7d33b0e","Vulnerability Management","vulnerability-management","Missing scans, no risk prioritization","#fb923c",{"id":38,"name":39,"slug":40,"description":41,"color":42},"1ec88fde-2d0f-4ed8-932a-33f5ccc0fdc7","Access Control","access-control","Excessive privileges, missing MFA, weak auth","#f97316",{"id":44,"name":45,"slug":46,"description":47,"color":48},"af7fce9e-1ce8-4156-93bc-09dcfbfdf29d","Patch Management","patch-management","Unpatched vulnerabilities, delayed updates","#ef4444",[]]